Muhammet Ikbal K.

🏆 Top Rated · 100% Job Success · 1,000+ verified hours on Upwork 📱 10 years in software, the last 6 specialized in Flutter — with hundreds of production releases shipped through App Store & Google Play review I build and ship consumer mobile apps end to end — Flutter on the front end, Node.js/NestJS on the back end, and everything in between — from the first commit to live releases on the App Store and Google Play. WHAT I CAN OWN FOR YOU ✅ Cross-platform Flutter apps — iOS + Android from one codebase, smooth 60 FPS UI ✅ Node.js / NestJS / TypeScript backends — clean, documented REST APIs ✅ Authentication, user profiles, and role-based access control ✅ Payments & subscriptions — my core specialty. I use RevenueCat as the backbone for in-app purchases and subscription systems: paywalls, entitlements, trials & offers, and both stores' billing edge cases ✅ Push notifications (FCM), analytics, and CI/CD for automated releases ✅ Full App Store & Google Play submission — I handle review, rejections, and updates myself ✅ AI features — LLM-powered chat & assistants, plus on-device ML with TensorFlow and ML Kit Every app in my portfolio below shipped to both the App Store and Google Play — most with me as the sole engineer from architecture to release. TECHNICAL TOOLBOX • Architecture: layered architecture, repository pattern, MVC & MVVM, SOLID principles • State management: Bloc/Cubit, Riverpod, Provider, GetX, GetIt • Firebase: Auth, Firestore, Cloud Functions, FCM, Storage, Realtime DB • Databases: PostgreSQL, MySQL, MariaDB, Firestore, Supabase, SqfLite • Payments & subscriptions: RevenueCat (expert), App Store & Google Play billing, paywall/entitlement design, subscription webhooks & analytics • UI: pixel-perfect custom Flutter; FlutterFlow for rapid prototyping — or migrating you off it • AI/ML: LLM/OpenAI integrations, TensorFlow, Google ML Kit, OpenCV, computer vision • Also fluent in: React Native, native Android when platform-specific depth is needed HOW I WORK Clear communication, honest estimates, and a bias toward shipping. I take ownership of architecture decisions, write maintainable code your next developer will thank you for, and stay available after launch. I also leverage the most powerful AI tools on the market to move fast — but never on autopilot: every line goes through my own review, so you get AI speed with senior-engineer quality control. Message me about your app and I'll reply with a concrete plan — not a template.